If you don't know anything about Adventure Time I don't think I'd recommend this game at all, as it doesn't offer much for world building or give enough time to flesh out the characters.

That being said I enjoyed my time with this game, but in most cases even if you're an Adventure Time fan, I don't know if this game is significant enough to warrant your time.

Conceptually this game sounds awesome, a small island based open world game in the Land of Ooo, with large team turn based combat.

I have considered myself NOT a fan of most turn based combat for the last few years, but even for how shallow it is, I owe this game for getting me back into turn based strategy games.
I was upset with how short this game was so I got South Park: The Stick of Truth, which I'm glad about.